I was just looking over my tires on my new-to-me TJ; tires look like new; not a mark on the side-walls, but the dot code shows they're from 2001.
(last 4 on the dot code: 5001)
lots of tread, evenly worn. (can't see "wear" at all, its so even). PO only put 10,000 miles on the vehicle in the 10 years he owned it. (used only for plowing his driveway), and I think much of the time, it was garaged.
but still---12 year old tires?